Pump cassette



FIG. 1 is a top, front perspective view of a pump cassette, showing our new design;

FIG. 2 is a bottom, rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a cross-sectional view thereof taken along line 4--4 of FIG. 3;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is an end elevational view thereof;

FIG. 7 is a top, front perspective view of an alternate embodiment of the pump cassette;

FIG. 8 is a bottom rear perspective view thereof;

FIG. 9 is a top plan view thereof;

FIG. 10 is a cross-sectional view thereof taken along line 10--10 of FIG. 9;

FIG. 11 is a bottom plan view thereof; and,

FIG. 12 is an end elevational view thereof. 

The ornamental design for a pump cassette, as shown and described. 